-Was his father very strict with him when he was at school?
题目
-Was his father very strict with him when he was at school?
-Yes.He had never praised him ___ he became one of the top students in his grade.
A.after B.before C.until D.unless
答案
B.before
他上学的时候他父亲对他很严格吗?
是的,在他成为年级优秀生之前他父亲从没表扬过他.
只有BC意思上是成立
但是not until句型主句不用完成时
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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